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Senior UI Engineer

Haystack
Department:UI UX Design
Type:REMOTE
Region:UK
Location:Belfast, Northern Ireland, United Kingdom
Experience:Mid-Senior level
Estimated Salary:£60,000 - £90,000
Skills:
HTMLCSSSASSJAVASCRIPTTYPESCRIPTREACTFIGMAADOBE XDSEO
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Job Description

Posted on: June 19, 2026

We are working with a modern, cloud-native digital consultancy that delivers exceptional engineering, composable commerce solutions, and data-driven digital experiences. With a highly experienced team, they operate on a remote-first basis and are scaling at pace, prioritising individuals who bring unique value beyond just technical skills. The Role

  • Design and build high-quality, performant, and cohesive user interfaces across various client projects and internal products.
  • Collaborate closely with back-end engineers, UX designers, and visual designers to determine the structure, layout, and behaviour of modern web interfaces.
  • Implement responsive, accessible, mobile-first user interfaces using HTML, CSS, SASS, and modern JavaScript/TypeScript.
  • Build robust and maintainable React applications, including SSR and statically-generated pages.
  • Optimise web pages for speed, scalability, and smooth user interactions, while writing clean, reusable, and testable front-end code.
  • Debug, diagnose, and resolve functional, visual, and performance issues, translating design concepts into production-ready UI from Figma or Adobe XD.

What You'll Need

  • Strong proficiency in core web technologies: HTML, CSS, JavaScript (ES6+), and TypeScript.
  • Experience building production-grade React applications, including routing, data fetching, and SSR pages and components.
  • Strong understanding of UI/UX design principles and how user experience influences implementation, as well as responsive, adaptive, and mobile-first design.
  • Experience building and maintaining reusable component libraries with an emphasis on scalability, accessibility, and clean semantic code.
  • Experience working with design tools such as Figma or Adobe XD, and an understanding of SEO principles relevant to front-end engineering.
  • Excellent communication, interpersonal, analytical, and problem-solving skills.

What's On Offer

  • Competitive salary and share options under an HMRC-approved EMI scheme.
  • Remote-first working with access to co-working spaces and a budget for high-spec equipment and home-office setup.
  • 25 days annual leave plus bank holidays, pension matched up to 8%, Bupa Private Healthcare, and Health Assessments.
  • Training and professional development budget within a supportive, innovative, and inclusive team culture.

Apply via Haystack today!

Originally posted on LinkedIn

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